Using the location and depth of where a fossil is found to estimate age is called... a. radioactive dating
b. the law of superposition
c. index fossils
d. the geologic time

the answer is c.) there is a warm front in region a and a stationary front in region b.

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.